
D. F. YANG ET AL.111
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River and Loushan River, the PHC content in the water
body in Jiaozhou Bay fell gradually (Figure 3).
3.3. Seasonal Distribution
In spring, in the whole water body of Jiaozhou Bay, the
PHC content range in the surface water was from 0.08
mg/L to 0.32 mg/L, while in summer it was from 0.10
mg/L to 1.10 mg/L, reaching a very high value. At sta-
tions H34 and H40, the minus value between the PHC
contents in August and May were minus, ranging from
–0.02 to –0.01, but the values of other stations were
positive, ranging from 0.01 to 0.91. Station H34 was
located outside of the Bay, while station H40 was in the
northernmost part of the Bay, which demonstrated that in
the surface water body of the Jiaozhou bay, almost all the
PHC content in the surface in summer surpassed that in
spring.
4. Discussion
4.1. Water Quality
In the Jiaozhou Bay waters, the PHC content in spring
reached the CategoryⅡand Ⅲ, so did it in summer. In
addition, in summer, the PHC content in some waters
was far beyond the Category Ⅲ, which indicated that
PHC had seriously polluted the waters. Therefore, in the
whole year, the waters of the Jiaozhou Bay were seri-
ously polluted by PHC in spring, while the pollution was
even more severe in summer.
4.2. Pollution Sources
In the temporal scale, the PHC change in between spring
and summer was taken into consideration. The results
showed that in Jiaozhou bay, almost all the PHC content
in the surface water in summer was higher than that in
spring. Thus, from spring to summer, the PHC content in
the whole waters of the bay increased. In addition, in
spatial scale, the estuaries of Haibo River, Licun River
and Loushan River were in the northeastern waters of
Jiaozhou Bay, and these rivers provided a transport for
the northeastern coastal waters of the bay. Along the
flowing direction of rivers, the change of PHC content
with gradients showed a declining tendency from the
high content to low. In spring, in the coastal waters be-
tween the estuaries of these two rivers, Haibo River and
Licun River, an area with a high PHC content formed; in
summer, in the coastal waters between the estuaries of
the two rivers, Licun River and Loushan River, an area
with a high PHC content also formed. The results indi-
cated that Haibo River, Licun River and Loushan River
in the northeast in Jiaozhou Bay were the main sources
of PHC pollution.
4.3. Transfer Process
In the waters of Jiaozhou bay, the PHC content trans-
fered from the estuary to the outside of the bay.
In the eastern and northeastern coast of the Jiaozhou
bay, there were industry-intensive areas in Qingdao city.
Thus, the industrial wastewater and the domestic sewage
were discharged a lot. There existed three rivers, includ-
ing Haibo River, Licun River and Loushan River along
the eastern and northeastern coast of the Jiaozhou Bay,
which played the function of discharging the industrial
wastewater and the domestic sewage into the Jiaozhou
Bay, bringing a large number of pollutants with PHC
into the bay.
In spring, Haibo River and Licun River run into the
sea in the northeast of the bay, bringing a large amount
of PHC from the land, and leading to serious pollution of
PHC in the eastern and northeastern areas of Jiaozhou
bay. The results revealed that the PHC content was high-
er in the northeastern areas of the Bay, decreasing gradu-
ally towards the southwest. And the PHC content in
spring was comparatively lower in the waters of Jiao-
zhou bay.
In summer, Licun River and Loushan River ran into
the sea from the northeast of the Bay, bringing a large
amount of PHC from the land. At the same time, the riv-
ers in the rainy season resulted in a widespread increase
of PHC content in the whole waters body of Jiaozhou
bay. The results revealed that in summer, the PHC con-
tent began to increase gradually in the eastern and north-
eastern areas of Jiaozhou Bay, and it was higher, de-
creasing gradually towards the southwest. And the PHC
content in summer was comparatively higher in the wa-
ters of Jiaozhou bay.The content of PHC was high in the
waters of the Jiaozhou Bay.
5. Conclusions
In May, the PHC content in the whole waters of Jiaozhou
bay reached the CategoryⅡ, and in the coastal waters of
the bay northeast, it reached the Category Ⅲ. In addition,
in other waters including the center, mouth and outside
of the bay, it reached the CategoryⅡ.
In August, the PHC content in the whole waters of
Jiaozhou bay reached the CategoryⅡand Ⅲ, and in the
coastal waters of the bay northeast, it was worse than the
Category Ⅲ. On the other hand, in other waters includ-
ing the center, mouth and outside of the bay, it reached
the CategoryⅡ. The results showed that in the temporal
scale it has been increasing from spring to; in the spacial